<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        body{
            background-color: rgb(244, 244, 244);
        }
        div.container{
            width: 100vw;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        table{
            border-collapse: collapse;
            border-radius: 5px;
            width: 60vw;
        }

        th{
            padding: 10px 8px;
            font-size: 14px;
            text-align: center;
            background-color: rgb(229, 229, 229);
        }

        th:nth-of-type(1){
            width: 20%;
        }

        th:nth-of-type(2){
            width: 40%;
        }

        th:nth-of-type(3){
            width: 40%;
        }

        td{
            border-bottom: solid 1px #ccc;
            padding: 10px 8px;
            background-color: #fff;
            font-size: 14px;
            text-align: center;
        }
    </style>
</head>
<body>
    <div class="container">
        <table>
            <thead>
                <tr>
                    <th><span>学号</span></th>    
                    <th><span>姓名</span></th>
                    <th><span>分数</span></th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>1</td>
                    <td>小明</td>
                    <td>删除</td>    
                </tr>
                <tr>
                    <td>1</td>
                    <td>小明</td>
                    <td>删除</td>    
                </tr>
            </tbody>  
        </table>
    </div>
</body>
</html>